Improved Chemical Detection and Ultra-Fast Recovery Using Oxygen Functionalized Epitaxial Graphene Sensors
作者： Venkata Karthik Nagareddy , Hua Khee Chan , Sandra C. Hernandez , Virginia D. Wheeler , Luke O. Nyakiti
DOI: 10.1109/JSEN.2013.2259154
关键词:
摘要: Oxygen functionalized epitaxial graphene (OFEG) sensors are demonstrated toward the sensing of polar chemical vapors at room temperature. The electrical characteristics sensor show an increase in resistance upon exposure to protic chemicals while decreased for aprotic average response and recovery times OFEG all analyte 10 100 s, respectively. In comparison, non-functionalized (NFEG) similar as OFEG, but with extremely long rates range ~1.5-2 hours. dipole moment is found have a strong impact on magnitude both NFEG which increased increasing from 2.0 D 4.1 D. However, exhibits significantly higher sensitivity (twofold increase) over sensors. For example, exposing n-methyl-2-pyrrolidone produces 45% change resistance, comparison 27% displayed by noise spectral density follows typical 1/f dependence di-methylformamide lower 1 × 10-18A2/Hz 10-17 A2/Hz Hz. contrast, displays unique 1/f2 behavior frequency (1-10 Hz) significant 3 2 10-15 A2/Hz.
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